Interfacial Redox Phenomena for Enhanced Aqueous Supercapacitors. Issue 5 (1st January 2015)

• Record Type: Journal Article
• Authors: Fic, Krzysztof; Meller, Mikołaj; Frackowiak, Elzbieta
• Is Part Of: Journal of the Electrochemical Society. Volume 162:Issue 5(2015)
• Page Start: A5140
• Page End: A5147
• Publication Date: 2015-01-01
• Subjects: Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0251505jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : The paper reports on electrochemical characterization of several supercapacitors operating in aqueous electrolytes and discusses a strategy for enhancing their performance. Various electrolytes such as alkaline (6 mol L −1 KOH), acidic (1 mol L −1 H2 SO4 ) and neutral (1 mol L −1 KI and 1 mol L −1 Na2 S2 O3 ) were investigated in terms of electrochemical stability and redox activity. A new concept of capacitor with two electrodes operating in different electrolytes is demonstrated. The positive electrode worked in KI solution whereas KOH solution served as an electrolytic medium for the negative electrode. As a result, improved capacitance values and energy density for a capacitor with a combined electrolyte have been obtained because of the beneficial redox phenomena on both electrodes.